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• 09:17, 6 June 2025 Admin talk contribs created page Substances (Created page with "Drugs, alcohol, and other psychoactive substances have have significant effects on sleep. == Caffeine == Caffeine is the most widespread psychoactive drug in the world<ref name="abc.net" /> and is contained in large quantities in coffee and, in lower concentration, in other beverages that are regularly consumed to temporally ward of drowsiness or increase mental performance. Caffeine relieves drowsiness by blocking adenosine receptors in the brain, due to a similar...")